Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran.
D-8 International University, Hamedan, Iran.
Sci Rep. 2022 Nov 10;12(1):19202. doi: 10.1038/s41598-022-23959-3.
Despite the presence of light-sensitive species in the polyol synthesis of silver nanocubes, the influence of light on it has yet to be investigated. Herein, we demonstrated that light radiation, by generating plasmon-based hot electrons and subsequently increasing the reduction rate of Ag in the system, in addition to enhancing the growth rate of nanocubes, causes twinned seeds, which these seeds are then converted into nanorods and right bipyramids. With shorter, higher energy wavelengths, Ag reduction progresses more quickly, resulting in structures with more twin planes. The overlap of the excitation wavelength and the band gap of AgS clusters formed in the early stages of synthesis accelerates the rate of reaction at low-energy excitation. According to our findings, the surfactant polyvinylpyrrolidone acts as a photochemical relay to drive the growth of silver nanoparticles. Overall, this work emphasizes the impact of excitation light on polyol synthesis as a technique for generating Ag nanocubes of various sizes.
尽管多元醇合成法中存在光敏感物种，但光照对其的影响尚未被研究。在此，我们证明了光辐射可以通过产生基于等离子体的热电子，并进一步提高体系中 Ag 的还原率，从而除了提高纳米立方体的生长速度外，还会导致孪晶种子的形成，这些种子随后会转化为纳米棒和正二十面体。较短、能量较高的波长会使 Ag 还原更快进行，从而导致具有更多孪晶面的结构。在合成的早期阶段形成的 AgS 簇的激发波长和带隙与重叠会加速低能激发时的反应速率。根据我们的发现，表面活性剂聚乙烯吡咯烷酮充当光化学继电器，驱动银纳米颗粒的生长。总的来说，这项工作强调了激发光对多元醇合成的影响，这是一种用于生成各种尺寸的 Ag 纳米立方体的技术。
